mailer1213.agnitas.de has no CNAME records.
Question and response
Question
dig mailer1213.agnitas.de. NS
Answer
The response has no answer records.
Authority
agnitas.de. 1184 SOA a.prim-ns.de. hostmaster.nexinto.net. 2026022325 28800 7200 604800 1200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0